I think its all gearing.. with 14t front and 47t rear my 2000 DRZ400E at its worst has seen 10km/l when sitting at 110kph for a short highway sprint and then trail riding and then 110kph short highway sprint home again..
then with 15t front and 47t rear I can get around 20km/l adventure riding/sitting at 110kph for long trips
15t front is pretty good compromise but you need to work the clutch a whole lot more hill climbing, unless you get a run up
they are great bikes, my only gripe is with the hard seat
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